Apportioned ATC Safety Criteria Based on Accident Rates

The EUROCONTROL Safety Regulatory Requirement on Risk Assessment and Mitigation (ESARR 4) and European Commission Regulation No. 2096/2005 deals with the need to assess changes to safety critical operations before they are introduced into operations. Overall safety criteria must be apportioned within a risk budget in order to limit safety assessments. This paper examines apportionment of air traffic control risk over parts of flights such as "taxiing" or "take off." For air traffic control accidents, an overall frequency per flight is determined. The distribution of risk over the various elements is determined according to accident and flight data, with air traffic control-related accident rates varying over departures, landings, taxiing, etc. Five principles are developed for applying risk budgets across the various air traffic control sub-products.